Thanks for the reply.
Some of the examples can not be opened in Eclipse. For example, the rule flow https://github.com/krisv/jbpm/blob/master/jbpm-persistence-jpa/src/test/resources/VariablePersistenceStrategyProcess.rf can not be opened as the variable types use the package org.jpm.*. If the types are changed to org.drools.*, the ruleflow can be seen, but the tests would fail as tests would expect org.jpm.*. It appears that this example uses latest package notation, whereas the eclipse still uses older package details for the variable types.